高温对岩石力学性能及微观硬度影响
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摘要
为分析高温后骨料对混凝土性能的影响,研究不同目标高温后石灰岩和辉绿岩外观、质量损失、压碎指标及微观硬度值,得到石灰岩和辉绿岩温变规律。试验结果表明,温度超过500℃后石灰石质量会急剧减小,而辉绿岩质量基本保持不变;两种岩石的压碎指标在临界温度后都急剧减小,其中石灰岩的临界温度为400℃,辉绿岩的临界温度为500℃。在显微硬度方面,石灰石的硬度先增大后减小,辉绿岩的硬度先增大后减小而后又增大,其硬度规律呈现N型。由此可见,硬度和压碎指标与温度变化并无太大联系。但在200～400℃之间,石灰岩和辉绿岩的力学性能都有增大趋势。
In order to analyze the effects of aggregate on concrete properties after high temperature,it can be studied that the appearances,quality loss,crush index and microhardness of limestone and diabase at different high temperature,thus,the temperature change rules of limestone and diabase can be obtained. It was indicated that in temperature above 500 ℃,the quality of Limestone will sharp drop,while diabase keeps constant basically. The crush index of limestone and diabase decreased rapidly after exceeding the critical temperature. The critical temperature of limestone is 400 ℃ and the diabase is 500 ℃. In the aspect of microhardness,the value of Limestone increases first and then decreases,and the value of diabase increases first,then decreases and then increases,which emerges the shape of "N". It can be seen that hardness and crush indicators do not have much connection with temperature. Between 200 ～ 400 ℃,the mechanical properties of limestone and diabase tend to increase.
In order to analyze the effects of aggregate on concrete properties after high temperature,it can be studied that the appearances,quality loss,crush index and microhardness of limestone and diabase at different high temperature,thus,the temperature change rules of limestone and diabase can be obtained. It was indicated that in temperature above 500 ℃,the quality of Limestone will sharp drop,while diabase keeps constant basically. The crush index of limestone and diabase decreased rapidly after exceeding the critical temperature. The critical temperature of limestone is 400 ℃ and the diabase is 500 ℃. In the aspect of microhardness,the value of Limestone increases first and then decreases,and the value of diabase increases first,then decreases and then increases,which emerges the shape of "N". It can be seen that hardness and crush indicators do not have much connection with temperature. Between 200 ～ 400 ℃,the mechanical properties of limestone and diabase tend to increase.
引文
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2汪智勇,张文生,叶家元.高强水泥基材料研究进展[J].硅酸盐通报,2009,28(4):761-765Wang Zhiyong,Zhang Wensheng,Ye Jiayuan.Research progress in high strength cement-based materials[J].Bulletin of the Chinese C-eramic Society,2009,28(4):761-760
3吴锋,卓家寿.混凝土材料破坏过程的细观数值模拟[J].重庆交通大学学报(自然科学版),2008,27(5):705-708Wu Feng,Zhuo Jiashou.Numerical simulation of fracture propagationof concrete on meso-level[J].Journal of Chongqing Jiaotong University(Natural Science),2008,27(5):705-708
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5张文妍,李保玺,曲烈,等.水泥与砂子种类对水泥基材料高温力学性能的影响[J].天津建设科技,2018,28(3):1-4Zhang Wenyan,Li Baoxi,Qu Lie,et al.Effect of cement and sand types on mechanical properties of cement based materials at elevated temperature[J].Tianjin Construction Science and Technology,2018,28(3):1-4
6董香军,丁一宁,王岳华.高温条件下混凝土的力学性能与抗爆裂[J].工业建筑,2005(35):703-705Dong Xiangjun,Ding Yining,Wang Yuehua.Mechanical and antispalling performance of concrete subjected to high temperatures[J].Industrial Construction,2005(35):703-705
7方继伟,卢文良,彭加欣,等.高温后混凝土强度变化试验研究[J].兰州交通大学学报,2017,36(3):36-40Fang Jiwei,Lu Wenliang,Peng Jiaxin,et al.Experimental research on strength changes of heated concrete[J].Journal of Lanzhou Jiaotong University,2017,36(3):36-40
8王丽,周林聪,曲海坤.高温作用下混凝土力学性能试验分析[J].施工技术,2017,46(24):26-28Wang Li,Zhou Lincong,Qu Haikun.Experimental analysis of mechanical properties of concrete under high temperature[J].Construction Technology,2017,46(24):26-28